Combustion-tube for igniters.



H. B. SHAW.

COMBUSTION TUBE FOR IGNITERS.

APPLICATION FILED NOV. II. 1916 1,290,376., Patented Jan. 7,1919.

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ROBERT EB. SHAW, F OAK PARK, ILLINOIS.

GOMBUSTION-TUIBE FOR lIGrNlllEhS.

specification of Letters Patent.

Patented ran. a, torn.

Application filed November 11, 1518. Serial No. 130,831

To all whom it may concern:

Be it known that 1, ROBERT E. SHAW, a citlzen of the United States, residing at Uak Park, in the county of Cook and'State of Illinois, have invented new and useful lmprovements in Combustion-Tubes for lgniters, of which the following is a specification. t

This invention relates to combustion tubes for igniters, the object in view being to produce what may be termed a hot combustion tube for use in connection with the spark plugs now commonly employed in gas and internal combustion engines, the device adhering matter, producing a hotter spark,

and improved combustion in the main combustion chamb"r of the cylinder in connection with which the device is used.

A. further object in View is to provide a devi e of the character referred to, the construction of which insures a distribution or difiusion of the highly heated and ignited as immediately after the gas or mixture is ignited and as it enters the main combustion chamber of the cylinder.

With the above and other objects in view, the invention consists in the novel construction, combination and arrangement of parts, as h'rein described, illustrated and claimed.

Tn the accompanying drawing:--

Figure 1 is a perspective view of the device per cc.

Fig. 2 is a diametrical longitudinal section through the device in its applied relation to a spark plug and engine.

' Fig. 3 is a cross section on the line 3-8 of Fig. 52.

The device contemplated in this invention is preferably made in one piece comprising a body designated generally at A, the same b"ing threaded at l so that it may be screwed into the usual spark plug hole of an internal combustion engine.

Une end portion of the devi e is enlarged as shown at 2, forming a shoulder 3 adapted to bear against the engine in the same manner as a spark plug and provided with a nut-like portion a 'to receive a wrench. The enlarged portion of the device is internally threaded as at 5 to enable the threaded portion of the ordinary spark plug to be screwed therein in the same manner that thev ordinary spark plug is screwed into the hole of a cylinder or engine.

The device also comprises a projecting tubular extension 6. When the device is 1n position, the extension 6 projects into the combustion chamber of the engine and is therefore highly heated by the repeated en. plosions occurring in said combustion chamber. Thebody is formed with a central longitudinal bore as shown forming a combustion rhamber 7, the enlarged portion of the body where it is counterbored and threaded to rcceive the spark plug, leaving an internal annular shoulder 8 against which the inner end of the spark plug shown at 9 may hear when in its final position.

Within the combustion chamber 8 there till is a partition 10 for dividing up the small understood that the partition may have as many branches as may be found desirable so as to divide the volume of gas into two or more parts. slanting holes or ports 11 are formed in the extension at the inner end of the device, there being one of such ports for each space betw'ien the bran'hes of the internal partition. These ports allow a portion of the mixture in the combustion chamber to enter the device and also to escape therefrom after being ignited. By providing a number of such ports, the gas immediately'around the el ctrodes of the plug, after being ignited, is distributed throughout the zone of explosive mixture surrounding the inwardly extending part of the device, "resulting in a quicker explosion of the main charge of mixture in the combustion chamber of the ngine.

The inner end of the device is formed with a concavity or dished face 12 for the purpose of preventing oil and carbon from being blown against the electrodes of the spark plug so as to foul the same.

The extension or inner end portion of the device containing the partition absorbs heat from the repeated explosions and the mixtur passing inwardly through the ports of the device and coming in contact with the till lllltl electrodes of the spark plug is thus highly heated. The partitions answer a double purpose; first to absorb and retain heat and transmit this heat to the mixture as it is forced against the partitions in passing into the combustion chamber; second to split up or equally divide the flame resulting from the ignition of the mixture, as the flame passes outwardly from the combustion chamber, giving a uniform ignition in the combustion chamber of the engine.- Without the partitions in the combustion chamber, suction of the engine .would be liable to draw more of a flame from one side than the other. causing an unequal explosion and expansion of the mixture in the main combustion chamber. .Another important feature resides in the fact that the mixture is highly heated and' expanded when it enters the combustion chamber of the device and before it reaches the electrodes. The combustion of this small quantity of rarefied mixture is eomparatively perfect or so nearly so that soot, carbon or other residue and accumulations around and upon the electrodes are consumed, keeping the spark plug in a clean and. )erfect working condition. In fact it has been demonstrated that a foul spark plug when used in conjunction with the de vice hercinabove described, will be thoroughly cleaned and freed from carbon and other adhering matter in one hours continual use. The device may be used in con nection with any spark plug, will enable a lower grade of liquid fuel to be used and nvill ignite a thinner mixture than is now possible with the ordinary plug not equipped with the device hereinabove described. The invention as a whole is designed to superheat that part of the mixture coming in contact with the spark plug. The partitions constitute the main superheating feature of the device, being contained within the extension point thereof or that point or part which projects into the combustion chamber of the engine and being unaffected b the water cooling system. In actual service, a temperature of about 1300 is maintained in the combustion chamber of the device in immediate proximity to the electrodes of the plug. Exhaustive tests have demonstrated that the plug is kept free from carbon and oil and successfully operates an engine on a very thin mixture. Tests carried out in connection with a number of high class cars have shown a fuel economy of better than 25%.

I claim:

1. A combustion tube for a spark plug, comprising a body internally threaded to receive a spark plug and having a central bore forming an individual combustion chamber for said plug, said bore being closed at the inner end of the body and a partition extending longitudinally of said bore and dividing the same into a plurality of subchambers, each having a port in the side wall thereof.

2. A combustion tube for a spark plug, comprising a body internally threaded to receive a spark plug and having a central bore forming an individual combustion chan'iber for said plug, said bore being closed at the inner end of the body and being partitioned into a plurality of sub-chambers, the body being externally threaded for attachment to an engine and having a portion or extension projecting inwardly beyond the threaded portion and formed with a plurality of ports intersecting the sub-cha1nbers of said combustion chamber, the inner end of the body being concaved, for the purpose specified.

Tn testimony whereof I affix my signature.

ROBERT B. SHAW". 

